The market as an economic means has a function as a means of distribution, price formation and as a place for promotion. Transportation is a derivative need due to economic, social, cultural activities and so on. In the macroeconomic framework, transportation is the backbone of the economy at the national, regional and local levels, for both urban and rural areas. The increase in traffic volume that is not matched by the growth of available road infrastructure will result in traffic congestion on the Banyumas highway - Purwokerto around the banyumas market. This is often caused by human behavior that is not aware of obeying traffic signs. The purpose of this study was to determine the performance of the road on the Banyumas - Purwokerto highway in front of the Banyumas market development and to determine the number of side barriers caused by the Banyumas market development activity on the Banyumas - Purwokerto highway section. The data used are primary data as follows: road geometry, traffic volume, side barriers. Road performance uses the Indonesian Road Capacity Manual. (MKJI 1997). The results of this study indicate that with market development activities, the volume of vehicles passing in the market area increases by 734 smp/jam . It can be concluded that the operation of the Banyumas market causes the impact of the performance of Jalan Banyumas Purwokerto to decrease, this can be seen from the degree of saturation, when the Banyumas market activity operates 0.97 with service level E (Traffic volume is approaching or at its capacity. Unstable flow with conditions that often stop). While the degree of saturation when the Banyumas market is not operating is 0.72 with a service level of C (In the stable flow zone. Drivers are limited in choosing speed).